US4112763A - Inspecting the interior of an enclosure - Google Patents
Inspecting the interior of an enclosure Download PDFInfo
- Publication number
- US4112763A US4112763A US05/701,026 US70102676A US4112763A US 4112763 A US4112763 A US 4112763A US 70102676 A US70102676 A US 70102676A US 4112763 A US4112763 A US 4112763A
- Authority
- US
- United States
- Prior art keywords
- instrument
- screen
- opening
- enclosure
- interior
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/02—Observation or illuminating devices
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/2476—Non-optical details, e.g. housings, mountings, supports
- G02B23/2492—Arrangements for use in a hostile environment, e.g. a very hot, cold or radioactive environment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
- F27D25/001—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag comprising breaking tools, e.g. hammers, drills, scrapers
Definitions
- the present invention relates to a device for inspecting the interior of an enclosure, especially (but not solely) for inspecting material contained in the enclosure.
- a device according to the invention can be used for observing the interior of any enclosure.
- the present invention provides a device for inspecting the interior of an enclosure, comprising:
- (d) means for periodically or continuously cleaning the surface of the screen remote from the instrument, at least at the part of the screen comprising the opening.
- the above device according to the invention is applicable, for example, in the observation of what is going on in an enclosure, or in measuring the surface temperature of material contained in the enclosure. It is sufficient to sealingly fix the device to any aperture of suitable dimensions formed in the wall of the enclosure.
- the enclosure could be a blast furnace or any other kind of furnace. So far as the instrument is concerned, it could be a simple sighting instrument, or a television camera sensitive to visible radiation or infra-red radiation, or any other radiation-receiving instrument (e.g. a telemeter or a pyrometer) either scanning or not.
- the device may further comprise means arranged to rotate the device about a point located close to the outlet orifice of the instrument.
- This variant allows the sighting axis of the instrument to be oriented at will in any directions, the whole device being, in this case, located in a sealed case.
- the screen may form part of a closed case containing the instrument, means being provided for turning the case in order to vary the direction from which radiation is received by the instrument.
- FIGURE shows a longitudinal cross-section through the end of an observation device for inspecting the upper surface of the burden in a blast furnace.
- the end of an objective is referenced 1 and is cylindrical in shape. Also visible are the side wall 2 of the blast furnace and the interior 3 of the furnace.
- the objective 1 is surrounded by two coaxial cylindrical jackets 4 and 5 whose ends are welded at 6 and 7 to a ring plate 8.
- the end of the objective 1 has an orifice or pupil 9 (less than 10 mm in diameter) in register with a small opening 10 in the screen 11 fixed (by screwing) to the plate 8.
- the pupil 9 permits sighting within an angle of at least 40° (preferably at least 60°), which is also permitted by opening 10 (less than 10 mm in diameter).
- the assembly is sealingly fixed to the side wall 2 by means of a conventional system including clamps 18 and bolts 9, around an aperture or bore 20 formed in the side wall 2.
- a compressed-air supply (not shown) ensures that dry, oil-free air flows between the objective 1 and the jacket 4 in the direction of the arrow 12 and then flows in the direction of the arrow 13 in the restricted space between the objective 1 and the screen 11, before escaping through the opening 10, thereby sweeping out the opening 10 towards the interior of the furnace.
- a scraper 15 which is reciprocated by a rod 16 along the axis 17 of the rod, ensures cleaning of the surface of the screen 11 remote from the objective 1 about the opening 10.
- the opening 10 and the area around it are regularly cleaned of undesirable material which tends to collect there.
Abstract
A device for inspecting the interior of an enclosure comprises an instrument which receives radiation from the interior of the enclosure through an orifice at one end of the instrument. A screen located immediately in front of the instrument has an opening in register with the orifice. Compressed gas is passed between the instrument and the screen and escapes through the opening. The surface of the screen remote from the instrument is cleaned periodically or continuously, e.g. by scraping, at least around the opening.
Description
The present invention relates to a device for inspecting the interior of an enclosure, especially (but not solely) for inspecting material contained in the enclosure.
The following description illustrates an application of the device to the inspection of the upper surface of the burden in a blast furnace. This is done, however, by way of example and without implying any limitation of the applicability of the device. A device according to the invention can be used for observing the interior of any enclosure.
There is a well-recognized interest in observing what goes on in a blast furnace at the upper surface of the charge or burden, e.g. the evolution of the shape of this surface, the distribution of surface temperatures from its centre to its periphery, and the appearance of hot spots or cold zones. These indications allow the operation of the blast furnace to be improved, this depending on appropriate addition of coke, ore, and fluxes as well as on accurate distribution of these materials across the whole of the upper surface of the burden.
The value of all data is of course subordinate to the fact of being able to correctly observe the burden by means of a device which is as reliable as possible. This condition cannot easily be met, because the space above the burden in the blast furnace may contain a compressed gas (for example, at a pressure of 2 kg per cm2 ) and is practically always very dusty.
In order to observe the charge inside a blast furnace, various devices have already been suggested which are generally of the type in which scanning occurs inside a practically fixed device, or of telemetric type. In most cases, these devices permit observation of the burden in a blast furnace through an inspection window of transparent material permanently cleaned from inside. The increase in back pressure inside blast furnaces has made the use of such inspection windows more risky. The inspection windows are difficult to clean satisfactorily by scraping. Moreover, it is difficult to ensure a jet of gas on the inner face of the inspection hole in order to clean it.
The present invention provides a device for inspecting the interior of an enclosure, comprising:
(a) an observation or measuring instrument which terminates at its observation end with a very small orifice (preferably smaller than 10 mm) having a large angular aperture (preferably greater than 60°);
(b) a screen located before and next to the instrument referred at (a) and formed with a very small opening (preferably smaller than 10 mm) facing the end opening of the instrument;
(c) means for circulating a compressed gas in the space between the instrument and the screen and then through the opening formed in the screen;
(d) means for periodically or continuously cleaning the surface of the screen remote from the instrument, at least at the part of the screen comprising the opening.
The above device according to the invention is applicable, for example, in the observation of what is going on in an enclosure, or in measuring the surface temperature of material contained in the enclosure. It is sufficient to sealingly fix the device to any aperture of suitable dimensions formed in the wall of the enclosure. The enclosure could be a blast furnace or any other kind of furnace. So far as the instrument is concerned, it could be a simple sighting instrument, or a television camera sensitive to visible radiation or infra-red radiation, or any other radiation-receiving instrument (e.g. a telemeter or a pyrometer) either scanning or not.
The device may further comprise means arranged to rotate the device about a point located close to the outlet orifice of the instrument. This variant allows the sighting axis of the instrument to be oriented at will in any directions, the whole device being, in this case, located in a sealed case. In particular, the screen may form part of a closed case containing the instrument, means being provided for turning the case in order to vary the direction from which radiation is received by the instrument.
The invention will be described further, by way of example only, with reference to the accompanying drawing, whose sole FIGURE shows a longitudinal cross-section through the end of an observation device for inspecting the upper surface of the burden in a blast furnace.
In the drawing, the end of an objective is referenced 1 and is cylindrical in shape. Also visible are the side wall 2 of the blast furnace and the interior 3 of the furnace. The objective 1 is surrounded by two coaxial cylindrical jackets 4 and 5 whose ends are welded at 6 and 7 to a ring plate 8. The end of the objective 1 has an orifice or pupil 9 (less than 10 mm in diameter) in register with a small opening 10 in the screen 11 fixed (by screwing) to the plate 8. The pupil 9 permits sighting within an angle of at least 40° (preferably at least 60°), which is also permitted by opening 10 (less than 10 mm in diameter).
The assembly is sealingly fixed to the side wall 2 by means of a conventional system including clamps 18 and bolts 9, around an aperture or bore 20 formed in the side wall 2.
A compressed-air supply (not shown) ensures that dry, oil-free air flows between the objective 1 and the jacket 4 in the direction of the arrow 12 and then flows in the direction of the arrow 13 in the restricted space between the objective 1 and the screen 11, before escaping through the opening 10, thereby sweeping out the opening 10 towards the interior of the furnace.
The inner faces of the ring 8 and the screen 11 are located in the same plane 14. A scraper 15, which is reciprocated by a rod 16 along the axis 17 of the rod, ensures cleaning of the surface of the screen 11 remote from the objective 1 about the opening 10. Thus the opening 10 and the area around it are regularly cleaned of undesirable material which tends to collect there.
Claims (7)
1. A device for inspecting the interior of an enclosure, comprising:
(a) an instrument for receiving radiation from the interior of the enclosure, the radiation being received through an orifice at one end of the instrument;
(b) a screen located immediately in front of the instrument a portion of said screen defining a surface interior to said enclosure, the screen having an opening in register with the said orifice, of the instrument said screen and said instrument defining a restricted space therebetween;
(c) means for passing a compressed gas through the space between the instrument and the screen and then through the opening in the screen; and
(d) means for cleaning at least that part of said surface of the screen remote from the instrument which part contains the said opening.
2. A device as claimed in claim 1, in which the screen forms part of a closed case containing the instrument.
3. A device as claimed in claim 1, in which the transverse dimensions of the said orifice and the said opening are smaller than 10 mm.
4. A device as claimed in claim 1, in which said orifice for the reception of radiation has an angular aperture of at least 40°.
5. A device as claimed in claim 4, in which the said angular aperture is at least 60°.
6. A device as claimed in claim 1, in which the said cleaning means comprises a scraper.
7. A device as claimed in claim 1, in which the screen has a recess which receives said one end of said instrument, said recess and said one end converging towards the opening.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE830895 | 1975-07-01 | ||
BE830895 | 1975-07-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
US4112763A true US4112763A (en) | 1978-09-12 |
Family
ID=3861230
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/701,026 Expired - Lifetime US4112763A (en) | 1975-07-01 | 1976-06-30 | Inspecting the interior of an enclosure |
Country Status (3)
Country | Link |
---|---|
US (1) | US4112763A (en) |
BE (1) | BE830895A (en) |
NL (1) | NL7607102A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1981001441A1 (en) * | 1979-11-20 | 1981-05-28 | Avco Corp | Air purging unit for an optical pyrometer of a gas turbine engine |
EP0374642A1 (en) * | 1988-12-20 | 1990-06-27 | British Steel plc | Observation of furnace interiors |
US20050252551A1 (en) * | 2002-07-05 | 2005-11-17 | Decourcy Michael S | Prevention of unwanted material accumulations |
EP1561521A3 (en) * | 2002-07-05 | 2006-03-15 | Rohm And Haas Company | Apparatus to prevent the accumulation of unwanted material |
CN103154653A (en) * | 2010-09-29 | 2013-06-12 | Tmt出铁测量技术有限公司 | Device and method for protecting an optical observation opening |
EP3242101A1 (en) * | 2016-05-04 | 2017-11-08 | Primetals Technologies Germany GmbH | Method for operating a safety gas system in a vacuum installation and vacuum installation |
US11435569B2 (en) | 2017-12-15 | 2022-09-06 | Mse Meili Ag | Process scope |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU685526B2 (en) * | 1994-12-07 | 1998-01-22 | Bluescope Steel Limited | Optical viewing apparatus |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2388386A (en) * | 1942-01-22 | 1945-11-06 | Wheclco Instr Company | Burner control apparatus |
US2745131A (en) * | 1950-03-22 | 1956-05-15 | Alois Vogt | Device for the cleaning of sight glasses allowing inspection of high vacuum rooms |
US3310356A (en) * | 1963-02-08 | 1967-03-21 | Gen Precision Inc | Lens protective device utilizing dual air streams |
US3402418A (en) * | 1966-04-25 | 1968-09-24 | Roy Gene Le | Wiper assembly for sight glass |
US3415994A (en) * | 1966-10-28 | 1968-12-10 | Navy Usa | Dual element infrared detector |
US3437807A (en) * | 1968-04-08 | 1969-04-08 | Forney Eng Co | Ultraviolet sensitive flame detector in cooled housing |
US3436965A (en) * | 1966-08-04 | 1969-04-08 | Land Pyrometers Ltd | Air-purge units for radiation pyrometers |
US3475859A (en) * | 1966-11-24 | 1969-11-04 | Centre Nat Rech Metall | Device for observing the contents of an enclosure |
US3609236A (en) * | 1968-09-30 | 1971-09-28 | Bethlehem Steel Corp | Apparatus for televising the interior of hazardous chamber |
-
1975
- 1975-07-01 BE BE6045075A patent/BE830895A/en not_active IP Right Cessation
-
1976
- 1976-06-29 NL NL7607102A patent/NL7607102A/en active Search and Examination
- 1976-06-30 US US05/701,026 patent/US4112763A/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2388386A (en) * | 1942-01-22 | 1945-11-06 | Wheclco Instr Company | Burner control apparatus |
US2745131A (en) * | 1950-03-22 | 1956-05-15 | Alois Vogt | Device for the cleaning of sight glasses allowing inspection of high vacuum rooms |
US3310356A (en) * | 1963-02-08 | 1967-03-21 | Gen Precision Inc | Lens protective device utilizing dual air streams |
US3402418A (en) * | 1966-04-25 | 1968-09-24 | Roy Gene Le | Wiper assembly for sight glass |
US3436965A (en) * | 1966-08-04 | 1969-04-08 | Land Pyrometers Ltd | Air-purge units for radiation pyrometers |
US3415994A (en) * | 1966-10-28 | 1968-12-10 | Navy Usa | Dual element infrared detector |
US3475859A (en) * | 1966-11-24 | 1969-11-04 | Centre Nat Rech Metall | Device for observing the contents of an enclosure |
US3437807A (en) * | 1968-04-08 | 1969-04-08 | Forney Eng Co | Ultraviolet sensitive flame detector in cooled housing |
US3609236A (en) * | 1968-09-30 | 1971-09-28 | Bethlehem Steel Corp | Apparatus for televising the interior of hazardous chamber |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1981001441A1 (en) * | 1979-11-20 | 1981-05-28 | Avco Corp | Air purging unit for an optical pyrometer of a gas turbine engine |
US4306835A (en) * | 1979-11-20 | 1981-12-22 | Avco Corporation | Air purging unit for an optical pyrometer of a gas turbine engine |
EP0374642A1 (en) * | 1988-12-20 | 1990-06-27 | British Steel plc | Observation of furnace interiors |
US4969035A (en) * | 1988-12-20 | 1990-11-06 | British Steel Plc | Observation of furnace interior |
US20050252551A1 (en) * | 2002-07-05 | 2005-11-17 | Decourcy Michael S | Prevention of unwanted material accumulations |
EP1561521A3 (en) * | 2002-07-05 | 2006-03-15 | Rohm And Haas Company | Apparatus to prevent the accumulation of unwanted material |
US7128085B2 (en) | 2002-07-05 | 2006-10-31 | Rohm And Haas Company | Valve mounting assembly having a fluid port for washing unwanted material accumulations off the valve |
US20070006535A1 (en) * | 2002-07-05 | 2007-01-11 | Decourcy Michael S | Prevention of unwanted material accumulations |
US7556055B2 (en) | 2002-07-05 | 2009-07-07 | Rohm And Haas Company | Prevention of unwanted material accumulations |
CN103154653A (en) * | 2010-09-29 | 2013-06-12 | Tmt出铁测量技术有限公司 | Device and method for protecting an optical observation opening |
US20130203335A1 (en) * | 2010-09-29 | 2013-08-08 | Tmt Tapping-Measuring-Technology Gmbh | Device and method for protecting an optical observation opening |
CN103154653B (en) * | 2010-09-29 | 2015-11-25 | Tmt出铁测量技术有限公司 | For the protection of the apparatus and method of optical viewport |
EP3242101A1 (en) * | 2016-05-04 | 2017-11-08 | Primetals Technologies Germany GmbH | Method for operating a safety gas system in a vacuum installation and vacuum installation |
US11435569B2 (en) | 2017-12-15 | 2022-09-06 | Mse Meili Ag | Process scope |
Also Published As
Publication number | Publication date |
---|---|
NL7607102A (en) | 1977-01-04 |
BE830895A (en) | 1976-01-02 |
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